Die-stock.



PATENTED JULY 2l, 1903.

R, BARTHOLOMUS.

DIE STOCK.

APPLIOATION FILED JAN. 2s, 190s.

2 SHEETS-SHEET 1.

N0 MODEL-v llnesses MMM A7 my,

wrm s Pneus co, www l u No. 734,034. PATENTBD JULY 21, 1903.

R. BARTHOLOMUS.

' DIE STOCK.

v APPLICATION FILED JAN. 28, 1903.

N0 MODEL. 2 SHEETS-SHEET 2- li/zrn @sus es In venm Patented July 21, 1903.

NITED STATES PAFIENT OFFICE.

RUDOLF BARTHOLOMUS,OF NUREMBERG, GERMANY, ASSIGNOR TO THE FIRM OF SUEDDEUTSOHE PRAECISIONSWERKZEUGEFABRIK BARTHOLO- MAEUS da CO., OF NUREMBERG, GERMANY.

DIE-STOCK.

SPECIFICATION' forming part ot' Letters Patent N o. 734,034, dated July 21, 1903.

Application filed January 28. 1903. Serial No. 140.891. (No model.)

To LEZ whom, it may concer-7e:

Be it known that I, RUDOLF BARTHOLQ- MUS, mechanical engineer, a subject of the Duke of Saxe-Ooburg-Gotha, anda resident of No. 83 Sulzbacherstrasse, Nuremberg, Ba-

varia, Germany, have invented certain new.

and useful Improvements in Die-Stocks; and

I do hereby declare the following to be a full,

clear, and exact description of my invention,

to such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a die-stock by means of which a number of threads of dit'-v The vannular part of the die-case a is provided witharightandleft hand thread. Into this case plates b are screwed, which are connected to each other by pins c. Between thev said plates b the rotatable and adjustable dies d are arranged with their pivotsf guided 3o in radial slots g in the plates b. The dies d are arranged in star shape about the pivots f, the length of the separate dies differing according to the diameter of the screws to be cut. Into recesses in the plates b disks hare inserted and connected to the said plates by' means ofscrews s, adapted to move in the slots t'. In these disks h eccentric slots 7c are provided, into which the ends of the diepivotsf engage. The two disks h are rigidly 4o connected to each other by a bow-shaped handle Z, by means of which they can be rotated 0n the plates b within the limits set by the stops m. By this means the dies d can be moved toward or away from each other.

The normal relative position of the plates b may be indicated in any convenient manner, (not shown,) and the proper relative position of the dies CZ is secured by means of the central box or bush n, which also serves as a guide for the stock. For this pur- 5o pose the said box fn, is provided with as many slots o as there are dies in action at a time, and ,these slots inclose the dies and hold the latter in the proper position. The said box ln, is also provided with aperturesp for the shavings to pass through. For changing the dies the box 'n is withdrawn'and the dies d unfastened and rotated by rotating the plates b by means of a key adapted to engage the holes g. When corresponding die-arms 6o are opposite each other, they are tixed by inserting the box. By screwing the plates b into the plate-case a the dies are then so fastened that any unintended movement thereof is prevented. Relative movement of the dies by the loosening of the plates during the cutting is impossible, for the reason that the thread in the case a is so arranged'that the plates b must be pulled toward each other, and therefore only grip the dies more tightly. It 7o a normal thread contained in the die-stock is to be cut somewhat more deeply or lightly, the screws s are loosened and the die-pivots f, engaging the slots 7c, are moved outward or inward by rotating the disks h by means of the handle Z. When the disks h are thereupon moved back to the normal position, the die-stock is again ready to cut normal threads.

Having new particularly described and ascertained the nature of my said invention and 8o in what manner the same is to be performed,

I declare that what I claim is- 1. In a universaldie-stock, the combination of an annular casing provided at the ends with oppositely-cut threads, threaded plates provided with radial slots and adapted to engage said ends, dies secured between said end plates provided with pivots adapted to engage said slots, a central bush slotted to receive the cutting ends of said dies and means for 9o moving and locking said dies.

2. In a die-stock, for cutting a variety of threads the combination of an annular casing provided with radially -slotted end plates, star-shaped dies secured in said casing having pivots engaging said-slots a central bush provided with slots for guiding said dies and In testimony whereof I aix my signature apertures for discharging shavings, a. rotata- I in presence of two witnesses.

ble side plate at each end having eccentric slots engaging said pivots, and a forked han- RUDOLF BARTHOLOMAUS' 5 die secured to said plates whereby they may Witnesses:

be rotated simultaneously, substantially as MAX SCHNEIDER, described. HEINRICH ENGELHARDT. 

